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Lab Gruppen E Series 12.2

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Earplug View Drop Down
Old Croc
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    Posted: 23 May 2022 at 8:31am
Anyone know what these have on the o/p?

No markings and I can´t find a service manual.

Ta.


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kedwardsleisure View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2022 at 12:38pm
phoenix in and out, the outputs are the heavy duty ones with flat blades.
Kevin

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2022 at 1:15pm
Originally posted by kedwardsleisure kedwardsleisure wrote:

phoenix in and out, the outputs are the heavy duty ones with flat blades.


I meant the O/P devices!  LOL

Obviously MOSFETS. I'm guessing IRFB4020, or maybe IRFP4227, but it would be good to know for sure.  Big smile


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2022 at 11:30am
So no LG technicians on here, then!  LOL

I'm getting the amp later, so it'll be a bit of plug-in-and-play! 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2022 at 12:56pm
I've never even seen one let alone fixed one. In the UK that end of the market is occupied by Cloud
Kevin

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2022 at 1:08pm
Ok. I'll post some photos later - hopefully without any flames!!   LOL LOL Shocked LOL LOL



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kedwardsleisure View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 25 May 2022 at 10:30pm
FWIW I've only ever seen 2 labs that have gone bang. One had been put on 415V and the other had, at best guess, a bottle of WKD poured into it while it was turned on. Both were repairable.
Kevin

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 26 May 2022 at 8:29am
Yes - Labs are usually quite reliable. Not sure what happened to this one.

The O/P MOSFETS are IRFB5615's, but unsurprisingly, the problem goes deeper. I replaced the damaged devices and the thing powers up, but still no output and the damaged channel clips early on the front LEDs.

There's a lot of smd's on the underside of the board, so undoubtably the problem is somewhere in there. I'm not sure what I'll do now, as I usually pass on smd-heavy stuff, especially without any schematics.

Anyway, some photos:-















 
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